Which came first?
Increasing temperatures melt ice to release trapped “old Methane” which increases the greenhouse gasses or increased greenhouse gasses cause temperatures to rise.
I would say, because of decomposing matter deep within the earth rising causes methane and increased temperature.
Since wasting matter varies in amounts, it causes the earth to cool down or warm up depending on the amount of methane released by shear force, not warming. Sort of like volcanos only in smaller amounts and spread over large areas.
The earth needs to fart, just like the rest of us!
That’s my opinion and I’m sticking to it. %%%>)